Cherry pick RestAPI callback fix for patch

[bbirman]

No description provided.

[github-actions]

	1 Error
🚫	Please re-submit this PR to the dev branch, we may have already fixed your issue.

Generated by 🚫 Danger

[github-actions]

	1 Warning
⚠️	Static Analysis found an issue with one or more files you modified. Please fix the issue(s).

Clang Static Analysis Issues

File	Type	Category	Description	Line	Col
SFRestAPI	Nullability	Memory error	nil assigned to a pointer which is expected to have non-null value	98	5

Generated by 🚫 Danger

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceSDKCore iOS ^18 Test Results	494 ran	494 ✅

Test	Result
No test annotations available

• View SalesforceSDKCore iOS ^18 Test Results

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.55%. Comparing base (dc4699b) to head (6ace4d7).
⚠️ Report is 273 commits behind head on master.

Files with missing lines	Patch %	Lines
...Core/SalesforceSDKCore/Classes/RestAPI/SFRestAPI.m	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3969      +/-   ##
==========================================
+ Coverage   61.44%   62.55%   +1.11%     
==========================================
  Files         233      250      +17     
  Lines       21699    22495     +796     
==========================================
+ Hits        13332    14072     +740     
- Misses       8367     8423      +56     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	70.58% <98.27%> (+1.51%)	⬆️
Core	52.46% <72.02%> (+2.30%)	⬆️
SmartStore	73.66% <ø> (-0.02%)	⬇️
MobileSync	87.66% <ø> (-0.10%)	⬇️

Files with missing lines	Coverage Δ
...Core/SalesforceSDKCore/Classes/RestAPI/SFRestAPI.m	89.05% <82.35%> (+0.41%)	⬆️

... and 70 files with indirect coverage changes

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[github-actions]

	Tests	Passed ☑️	Skipped	Failed ❌️
SalesforceSDKCore iOS ^26 Test Results	494 ran	491 ✅		3 ❌

Test	Result
SalesforceSDKCore iOS ^26 Test Results
SFSDKEncryptedPushNotificationTests.testNotificationTransformNonRSASecret	❌ failure
SFUserAccountManagerTests.testAuthHandler	❌ failure
SFUserAccountManagerTests.testUserAccountEncoding (failure 1/3)	❌ failure
SFUserAccountManagerTests.testUserAccountEncoding (failure 2/3)	❌ failure
SFUserAccountManagerTests.testUserAccountEncoding (failure 3/3)	❌ failure

• View SalesforceSDKCore iOS ^26 Test Results